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The Mosdef survey: Detection of [O III]λ4363 and the direct-method oxygen abundance of a star-forming galaxy at z = 3.08

  • Author(s): Sanders, RL
  • Shapley, AE
  • Kriek, M
  • Reddy, NA
  • Freeman, WR
  • Coil, AL
  • Siana, B
  • Mobasher, B
  • Shivaei, I
  • Price, SH
  • Groot, LD
  • et al.

Published Web Location

https://iopscience.iop.org/article/10.3847/2041-8205/825/2/L23/meta
No data is associated with this publication.
Abstract

© 2016. The American Astronomical Society. All rights reserved. We present measurements of the electron-temperature-based oxygen abundance for a highly star-forming galaxy at z = 3.08, COSMOS-1908. This is the highest redshift at which [O iii]λ4363 has been detected and the first time that this line has been measured at z > 2. We estimate an oxygen abundance of 12 + log(O/H) = 8.00-0.14+0.13. This galaxy is a low-mass (109.3 M⊙), highly star-forming (∼50M⊙ yr-1) system that hosts a young stellar population (∼160 Myr). We investigate the physical conditions of the ionized gas in COSMOS-1908 and find that this galaxy has a high ionization parameter, little nebular reddening (E(B-V)gas < 0.14), and a high electron density (ne ∼ 500 cm-3). We compare the ratios of strong oxygen, neon, and hydrogen lines to the direct-method oxygen abundance for COSMOS-1908 and additional star-forming galaxies at z=0-1.8 with [O iii]λ4363 measurements and show that galaxies at z ∼ 1-3 follow the same strong-line correlations as galaxies in the local universe. This agreement suggests that the relationship between ionization parameter and O/H is similar for z∼0 and high-redshift galaxies. These results imply that metallicity calibrations based on lines of oxygen, neon, and hydrogen do not strongly evolve with redshift and can reliably estimate abundances out to Z ∼ 3, paving the way for robust measurements of the evolution of the mass-metallicity relation to high redshift.

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